Loans and Allowance for Credit Losses for Loans - Summary of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 43,560,777	$ 34,153,657
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,514,458	5,847,551
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	26,909,459	20,790,066
Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	23,535,086	18,935,486
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,374,373	1,854,580
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,005,069	4,545,064
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,131,791	2,970,976
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	431,455	400,779
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	266,904	241,258
Collateral Pledged | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	100,783	95,335
Collateral Pledged | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	144,424	110,174
Collateral Pledged | Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	94,248	110,174
Collateral Pledged | Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	50,176	0
Collateral Pledged | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	21,695	35,745
Collateral Pledged | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2	$ 4